Spatial data
All of the information that can be tied to a specific locations.
Data with a geographic location, representation, or reference point that it describes.
Visually represented as layers which allow the user to select different sets of data to display
the main viewing window in a ...
All of the information that can be tied to a specific locations.
Data with a geographic location, representation, or reference point that it describes.
Visually represented as layers which allow the user to select different sets of data to display
the main viewing window in a stacking manner.
Cartography
The science of mapmaking, including data inclusion, layout, elements, colors, and
design.
Shapefile
A vector data storage format for storing the location, shape, and attributes of
geographic features.
An Esri proprietary data format for storing geographic data. Very cross-GIS compatible, but
limiting in many aspects. Often misused to mean any geographic dataset as in "could you send
me that shapefile?"
Layer
A) The distinct data elements that compose a map document, ordered one of top of
the next for GIS drawing order (top drawn is the last and seen first)
B) A single data element, saved into a GIS file format along with its associated symbiology.
The ratio of size of element on screen or in print on the map to their size in the real
world.
Raster
Spatial data that stores location based upon single origin point and a data stream of
known width, height, and resolution. Often used for continuous surfaces.
Rasters are characterized primarily by their width, height, cell size, and origin location. Each
cell in a single-band raster contains one value for the area covered by that pixel.
A grid of pixels with a uniform value within each pixel.
DEM
Digital Elevation Model- a representation of the terrain surface, created by
measuring a set of equally spaced elevation values
A specific case of raster data where the pixel value represents the elevation of areas covered
by the pixel. Sometimes called a DTM (digital terrain model) or DED (digital elevation
dataset).
Vector
Spatial data that stores location using Cartesian coordinate locations.
Point
A single spot in (usually) two dimensional space. Attributes represent only that location
(and sometimes are inferred to represent nearby locations)
Line (Polyline)
Multiple points connected to represent all locations in between along the connection.
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